[googlevideo:http://video.google.com/videoplay?docid=4572213210964169022&q=jfk+conspiracy&total=1265&start=0&num=10&so=0&type=search&plindex=9]

A bullet's bizarre trajectory-a grassy knoll; A suspect shot to death just two days after a president's assassination. Was it a plot by a national or international agency: the CIA, the FBI, or the KGB? Find out who had the most to gain -- and to lose.